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The 49-year-old actor has been a long-time supporter of the centre but bosses have apparently decided he isn't smart enough for a place alongside the intellectual elite.
A source told the Daily Star newspaper: "Brad has always supported the museum, so he asked if he could participate on a higher level.
"But while the committee admires Brad's ambition, the fear is that he might be a little on the dumb side to serve on an art board. He doesn't even have a college degree."
Taking on a role on the museum's board may have been ambitious for Brad because of more than his intelligence, though, after it was recently reported he and Angelina Jolie could be set for a move to the UK while he shoots a sequel to zombie blockbuster World War Z.
An insider previously said: ''Brad and Angelina are already planning for next year and have put the feelers out for properties.
''They would like to stay in Surrey like last time. Their kids are home-schooled so it won't cause much disruption.''
